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Thread: Power fans off of car?

  1. #11
    Variable Bitrate rEegLer's Avatar
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    Quote Originally Posted by colin View Post
    Your M2 is capable of 160 watts every here and there, with optimal cooling and solid line loads (no fluctuations). You wouldn't want to put more than say... 140 watts on it max. With those fans, you have 100 watts left. With a CPU (45 watts if it's low power) and a motherboard (25-30 watts with onboard sound)... well, add the harddrive and the GPS and you're done.

    Careful...
    It depends on what mobo he's getting, i have the new intel mini-itx with the atom and the whole package together only consumes 40W. If he is getting an ATX then yes there would be concern. Most of the dc-dc PSU's are meant for mini-ITX but some of the nicer ones could easily power an ATX mobo.

    As for powering the fans off the ignition, i don't think (emphasis on 'think') the 12v ignition would be enough to power your fans. It's a very low amp line, i believe is in the milliamps. The only real purpose of the ignition line is that it tells devices when the car is on, so its more of a data line than a power line.
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  2. #12
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    I don't mean the IGN line, I was more refering to an IGN source. My cig lighters are both switched sources and together they can handle 10 amps.

  3. #13
    Who am I? HiJackZX1's Avatar
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    From what i understand Fans dont take that much amps. i think i read that its like .08 amps and I may have the numbers transposed, but even so, that will not bog down the PSU at all.
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  4. #14
    Variable Bitrate Grrrmachine's Avatar
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    Quote Originally Posted by HiJackZX1 View Post
    From what i understand Fans dont take that much amps. i think i read that its like .08 amps and I may have the numbers transposed, but even so, that will not bog down the PSU at all.
    Quote Originally Posted by colin View Post
    6 fans, 1/2 A each = 3A. 3A * 12V = 36 watts.

    Trust me, that makes a difference.
    So Colin presumes half an amp per fan, and you say "oh no, 0.8A per fan." That's an even bigger draw - 57.6W in total. So even if you're using an Opus 150W, then that's a third of your available power gone, and from the 12V rail too.

    Your best option is to take a new line from your battery for your fans, fuse it, and put a relay in that is triggered by the IGN line or by the PSU itself. That way the fans come on as soon as the key is turned, and the PSU doesn't see the draw. You could even put in a little voltage regulator like this circuit here.

    What do you need 6 fans for anyway? Are you planning to run some massively intensive gaming rig off your car? If so, is your alternator up to it?

  5. #15
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    Quote Originally Posted by Grrrmachine View Post
    So Colin presumes half an amp per fan, and you say "oh no, 0.8A per fan."
    Check your decimal place. He said .08 Amps.

    I just checked a couple of fans online and the 80mm ones I looked at ranged from .12 to .23 Amps.

  6. #16
    Vendor - Qube colin's Avatar
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    Well my 1/2 amp was an accurate guess -- I looked at all my case fans and the 80-100mm ones are rated at 1/2A each at max draw. I have a fan controller too (came with the case back in the day when I was hardcore into gaming computers) and it says "0.3A 4 fans max 1.2A" so I guess that 0.3 is a fair average too.

    Actually, all my fans are LED lit so... 0.3 might be a better guess. Still...

  7. #17
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    Sorry for delayed responses in this thread. I have been out of town. I am getting this boards

    http://www.logicsupply.com/products/kino_9452

    and this cpu for it t7400 core 2 duo 2.16ghz

    I have six fans because my comp. components and my amp are housed in a compartment together. There is little space and my car is typically in the sun so they will be hot even when I start it up.

    I am getting this system because I do not want to have a slow comp. I hate that more than anything, and I know this will do the job.

  8. #18
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    I think 160 watts will do just fine. I will have at least 2gig ram.

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